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LS1 Gen 3 Pre Ignition

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  • #989464
    Cino BuccheriCino Buccheri
    Participant

      Hi Gino From Australia I have an LS1 in my VY Commodore SS, since i have done the following modification to my engine with the following
      CAM upgrade
      PART NUMBER: CT2871 49938B/49919A-112 DESCRIPTION: HOLD/CHEV LS1 GEN III HYD ROLLER CAM
      VALVE SETTINGS: INTAKE 0.000 HOT 0.000 HOT
      LIFT: INTAKE @ CAM .344″ @ VALVE .585″ ROCKER RATIO = 1.7
      EXHAUST @ CAM .341″ @ VALVE .580″
      CAM TIMING OPENS CLOSES ADV DURATION
      AT .006″ INTAKE 25 ° BTDC 69 ° ABDC 274 °
      TAPPET LIFT EXHAUST 71 ° BBDC 24 ° ATDC 275 °
      DURATION @.050″ CENTRE LINE LIFT at T.D.C
      IN 222° IN 110° IN .054″ LOBE SEPERATION ANGLE = 112°
      EX 224° EX 114° EX
      1 3/4″ headers into 2″ exhaust
      241 stock aluminum heads saved 30 thou
      I have a pre ignition mainly during the summer months when the engine reaches operating temperature between 1500 & 2000 RPM under load.
      I have swapped out the thermostat to a lower temperature opening thermostat, I have swapped out spark plugs to Brisk spark plugs and i have had timing taken out which is annoying as it has also reduced rwk.
      Any and all suggestions would be greatly appreciated
      Regards
      Gino

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    • #989467
      Nightflyr *Richard Kirshy
      Participant

        Common causes:
        Glowing hot or melted spark plugs
        Glowing hot exhaust valve
        Burning carbon embers

        Generally the fix(s) for pre ignition :
        Run higher octane fuel.
        Run the engine on the rich side.
        Try playing with ignition timing.

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